Savanna elephant numbers are only a quarter of their expected values
- Publication Date
- April 17, 2017
- Authors
- Ashley S. Robson, Morgan J. Trimble, Andrew Purdon, Kim D. Young Overton, et al
- Volume
- 12
- Issue
- 4
- Pages
- e0175942
- DOI
- https://dx.plos.org/10.1371/journal.pone.0175942
- Publisher URL
- http://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0175942
- Scopus
- 85017562035
- Mendeley
- http://www.mendeley.com/research/savanna-elephant-numbers-only-quarter-expected-values
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Mendeley | Further Information
{"title"=>"Savanna elephant numbers are only a quarter of their expected values", "type"=>"journal", "authors"=>[{"first_name"=>"Ashley S.", "last_name"=>"Robson", "scopus_author_id"=>"57192401345"}, {"first_name"=>"Morgan J.", "last_name"=>"Trimble", "scopus_author_id"=>"34973622000"}, {"first_name"=>"Andrew", "last_name"=>"Purdon", "scopus_author_id"=>"57193243115"}, {"first_name"=>"Kim D.", "last_name"=>"Young-Overton", "scopus_author_id"=>"56441772600"}, {"first_name"=>"Stuart L.", "last_name"=>"Pimm", "scopus_author_id"=>"7006131065"}, {"first_name"=>"Rudi J.", "last_name"=>"Van Aarde", "scopus_author_id"=>"35552019800"}], "year"=>2017, "source"=>"PLoS ONE", "identifiers"=>{"issn"=>"19326203", "scopus"=>"2-s2.0-85017562035", "pui"=>"615402119", "doi"=>"10.1371/journal.pone.0175942", "isbn"=>"1111111111", "sgr"=>"85017562035"}, "id"=>"b0b8ff5d-ea6d-37c5-9981-cf03ddd19448", "abstract"=>"Savannas once constituted the range of many species that human encroachment has now reduced to a fraction of their former distribution. Many survive only in protected areas. Poaching reduces the savanna elephant, even where protected, likely to the detriment of savanna ecosystems. While resources go into estimating elephant populations, an ecological benchmark by which to assess counts is lacking. Knowing how many elephants there are and how many poachers kill is important, but on their own, such data lack context. We collated savanna elephant count data from 73 protected areas across the continent estimated to hold ~50% of Africa’s elephants and extracted densities from 18 broadly stable population time series. We modeled these densities using primary productivity, water availability, and an index of poaching as predictors. We then used the model to predict stable densities given current conditions and poaching for all 73 populations. Next, to generate ecological benchmarks, we predicted such densities for a scenario of zero poaching. Where historical data are available, they corroborate or exceed benchmarks. According to recent counts, collectively, the 73 savanna elephant populations are at 75% of the size predicted based on current conditions and poaching levels. However, populations are at <25% of ecological benchmarks given a scenario of zero poaching (~967,000)—a total deficit of ~730,000 elephants. Populations in 30% of the 73 protected areas were <5% of their benchmarks, and the median current density as a percentage of ecological benchmark across protected areas was just 13%. The ecological context provided by these benchmark values, in conjunction with ongoing census projects, allow efficient targeting of conservation efforts.", "link"=>"http://www.mendeley.com/research/savanna-elephant-numbers-only-quarter-expected-values", "reader_count"=>64, "reader_count_by_academic_status"=>{"Unspecified"=>3, "Librarian"=>2, "Student > Doctoral Student"=>1, "Researcher"=>11, "Student > Ph. D. Student"=>13, "Student > Postgraduate"=>4, "Student > Master"=>5, "Other"=>5, "Student > Bachelor"=>13, "Lecturer"=>1, "Professor"=>3}, "reader_count_by_user_role"=>{"Unspecified"=>3, "Librarian"=>2, "Student > Doctoral Student"=>1, "Researcher"=>11, "Student > Ph. D. Student"=>13, "Student > Postgraduate"=>4, "Student > Master"=>5, "Other"=>5, "Student > Bachelor"=>13, "Lecturer"=>1, "Professor"=>3}, "reader_count_by_subject_area"=>{"Unspecified"=>3, "Environmental Science"=>21, "Biochemistry, Genetics and Molecular Biology"=>5, "Agricultural and Biological Sciences"=>25, "Psychology"=>1, "Social Sciences"=>1, "Computer Science"=>2, "Earth and Planetary Sciences"=>3}, "reader_count_by_subdiscipline"=>{"Social Sciences"=>{"Social Sciences"=>1}, "Psychology"=>{"Psychology"=>1}, "Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>3}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>25}, "Computer Science"=>{"Computer Science"=>2}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>5}, "Unspecified"=>{"Unspecified"=>3}, "Environmental Science"=>{"Environmental Science"=>21}}, "reader_count_by_country"=>{"Italy"=>1, "United Kingdom"=>1}, "group_count"=>1}CrossRef
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- http://doi.org/10.4102/koedoe.v61i1.1564
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Scopus | Further Information
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- {"id"=>"854052222287699969", "text"=>"Savanna elephant numbers are only a quarter of their expected values, a deficit of >700,000 #elephants #poaching https://t.co/BDRJMkA3Qj", "created_at"=>"2017-04-17T19:21:31Z", "user"=>"katzyna", "user_name"=>"Katarzyna Nowak", "user_profile_image"=>"http://pbs.twimg.com/profile_images/839843747588300800/dnChytam_normal.jpg"}
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- {"id"=>"854267182854922241", "text"=>"Our new paper used a few of the methods learnt from @AniMove @m_wegmann https://t.co/HyuL28aF0E #remotesensing #conservation #elephant", "created_at"=>"2017-04-18T09:35:42Z", "user"=>"purdon_andrew", "user_name"=>"Andrew Purdon", "user_profile_image"=>"http://pbs.twimg.com/profile_images/514056083409600512/JWsxXuFX_normal.jpeg"}
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- {"id"=>"854478495480561664", "text"=>"RT @purdon_andrew: Our new paper used a few of the methods learnt from @AniMove @m_wegmann https://t.co/HyuL28aF0E #remotesensing #conser…", "created_at"=>"2017-04-18T23:35:23Z", "user"=>"tapirunand", "user_name"=>"Agungnugrohozaini", "user_profile_image"=>"http://pbs.twimg.com/profile_images/791057209933168640/DHHAdHSx_normal.jpg"}
- {"id"=>"854651694906527744", "text"=>"RT @GW_Shannon: Savanna elephant numbers are only a quarter of their expected values https://t.co/QlZAey1DHn", "created_at"=>"2017-04-19T11:03:37Z", "user"=>"Trunk_n_Tails", "user_name"=>"Lizzie Webber", "user_profile_image"=>"http://pbs.twimg.com/profile_images/796486544278298624/NAlThXJd_normal.jpg"}
- {"id"=>"854697208603607041", "text"=>"Even in protected areas, savanna elephants are in trouble – just one quarter of their expected numbers. #PLOSONE https://t.co/HK5QqC9Lum", "created_at"=>"2017-04-19T14:04:28Z", "user"=>"JamesASchaefer", "user_name"=>"James Schaefer", "user_profile_image"=>"http://pbs.twimg.com/profile_images/642792417268117504/r7_55Q8r_normal.jpg"}
- {"id"=>"854805380370755584", "text"=>"This is a must read if you want to understand what is happening to #elephants @action4ifaw #conservation #Africa https://t.co/SAsXx5prSY", "created_at"=>"2017-04-19T21:14:18Z", "user"=>"AzzedineTDownes", "user_name"=>"Azzedine Downes", "user_profile_image"=>"http://pbs.twimg.com/profile_images/724430612799565826/g8UfS0nQ_normal.jpg"}
- {"id"=>"854853989866684417", "text"=>"Savanna elephant pops at less that 25% of what they should be. Great paper @purdon_andrew, congrats!\nhttps://t.co/TFQdszsXtk", "created_at"=>"2017-04-20T00:27:28Z", "user"=>"juliavanvel", "user_name"=>"Julia van Velden", "user_profile_image"=>"http://pbs.twimg.com/profile_images/663720083471093760/vxRWov63_normal.jpg"}
- {"id"=>"855053505781944320", "text"=>"Bad news: Less than we thought. #SavannaElephants #StopWildlifeTerrorism @elephanaticsbc @AfricanParks @elephantsdc https://t.co/5i0InIMlKq", "created_at"=>"2017-04-20T13:40:16Z", "user"=>"tusktaskforce", "user_name"=>"Tusk Task Force?", "user_profile_image"=>"http://pbs.twimg.com/profile_images/844624357963948033/s29fKxLp_normal.jpg"}
- {"id"=>"855126463867211778", "text"=>"To read the research article by @morgantrimble and her team, please visit this link: https://t.co/ggWKMcBtch #ElephantThursday", "created_at"=>"2017-04-20T18:30:11Z", "user"=>"elephanthursday", "user_name"=>"Elephant Thursday", "user_profile_image"=>"http://pbs.twimg.com/profile_images/545775959006126080/BikF8wAS_normal.png"}
- {"id"=>"856495667040202753", "text"=>"RT @SevincRende: [New paper] Savanna elephant numbers are only a quarter of their expected values https://t.co/7XDl9tQwoa #openaccess", "created_at"=>"2017-04-24T13:10:54Z", "user"=>"conserwatch", "user_name"=>"Conservation Watch", "user_profile_image"=>"http://pbs.twimg.com/profile_images/772157061845090304/BB8YwhBP_normal.jpg"}
- {"id"=>"857347190582280192", "text"=>"Not sure I believe math here: Savanna elephant numbers are only a quarter of their expected values https://t.co/A7oAeQZrn8 @ashley_s_morgan", "created_at"=>"2017-04-26T21:34:33Z", "user"=>"TZBirder", "user_name"=>"Colin Beale", "user_profile_image"=>"http://pbs.twimg.com/profile_images/1823949641/SafariEcology_normal.JPG"}
- {"id"=>"858477467069108224", "text"=>"RT @TZBirder: Not sure I believe math here: Savanna elephant numbers are only a quarter of their expected values https://t.co/A7oAeQZrn8 @a…", "created_at"=>"2017-04-30T00:25:52Z", "user"=>"tmorrison80", "user_name"=>"Tom Morrison", "user_profile_image"=>"http://pbs.twimg.com/profile_images/573704436654059520/hqlwxUYw_normal.jpeg"}
- {"id"=>"859671156420423680", "text"=>"Savanna elephant numbers are only a quarter of their expected values\n\nSavannas once constituted the range of many... https://t.co/ovii5uGRTr", "created_at"=>"2017-05-03T07:29:10Z", "user"=>"GrasslandSocSA", "user_name"=>"Grassland Society SA", "user_profile_image"=>"http://pbs.twimg.com/profile_images/1509758934/symbol_normal.jpg"}
- {"id"=>"892654099954630657", "text"=>"#PLOSONE: Savanna elephant numbers are only a quarter of their expected values https://t.co/GPCG1doaqh", "created_at"=>"2017-08-02T07:51:36Z", "user"=>"Plants_PCU_UCT", "user_name"=>"Plant Conservation", "user_profile_image"=>"http://pbs.twimg.com/profile_images/572394040809635840/mhLTOAQ3_normal.png"}
- {"id"=>"892786539725414401", "text"=>"New study documents deficit of 730,000 savannah #elephants, population numbers are 1/4 of expected values https://t.co/7J4lVX5b6D", "created_at"=>"2017-08-02T16:37:52Z", "user"=>"ts4biodiversity", "user_name"=>"Tanya Sanerib", "user_profile_image"=>"http://pbs.twimg.com/profile_images/662703209023082496/sbgOJ0zk_normal.jpg"}
- {"id"=>"892786876024737792", "text"=>"New study documents deficit of 730,000 savanna #elephants, population numbers are 1/4 of expected values https://t.co/7J4lVX5b6D", "created_at"=>"2017-08-02T16:39:13Z", "user"=>"ts4biodiversity", "user_name"=>"Tanya Sanerib", "user_profile_image"=>"http://pbs.twimg.com/profile_images/662703209023082496/sbgOJ0zk_normal.jpg"}
- {"id"=>"991311427800584193", "text"=>"Savanna elephant numbers are only a quarter of their expected values\nhttps://t.co/3e2ZINrqIA", "created_at"=>"2018-05-01T13:40:36Z", "user"=>"PVineski", "user_name"=>"OurWolves", "user_profile_image"=>"http://pbs.twimg.com/profile_images/434005917244207104/HJCAbuSw_normal.png"}
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